When suburban Chicago police were asked to check a Naperville home they say they walked into "unimaginable horror"...

(Police) "They saw blood in the hallway they went into the master bedroom where they found the two victims."

A seven-year old boy and five-year-old girl stabbed 50 to 100 times and their throats cut. State's attorney Bob Berlin says the boy was Elzbieta Plackowska's son and told them that she killed the girl she was babysitting because she saw the whole thing.

Prosecutors say Plackowksa was mad at her husband.

(Prosecutor) "Because he was gone most days as an over the road trucker. She was left to care for Justin and the house and she also had to work as a cleaning lady, which she felt was beneath her."

The two family dogs were also killed. Bond has been denied for Plackowska.